JP7658136B2 - Manufacturing method of laminated welded film body - Google Patents

Description

The present invention relates to a laminated welded film body, an ultrasonic welding machine, and a method for manufacturing a laminated welded film body.

Bags made of synthetic resin film are widely used to package goods. Patent Document 1 discloses an example of welding a small piece of synthetic resin film to a synthetic resin film bag. According to this, an operator overlaps the bag and the small piece and presses an ultrasonically vibrating horn to weld them together. When the overlapping films are ultrasonically vibrated by the horn, the films are heated by frictional heat and welded together. For the synthetic resin film, vinylidene chloride resin or olefin resin, which are easy to heat and weld, are used. Because the film is prone to tearing in the welded area, the small piece is welded to the bag to make it easier to open.

To make the bags stronger, bags made of a sheet of two or more layers of synthetic resin film are widely used. The sheet includes an adhesive layer and a protective layer. The adhesive layer is placed on the inside of the bag, and the protective layer is placed on the outside. For example, polyethylene or CPP (cast polyethylene) is used for the adhesive layer, and nylon or vapor-deposited PET (polyethylene terephthalate) is used for the protective layer. The adhesive layer has a lower melting point than the protective layer, and is easily heat-sealed. This makes it easy to form bags. The protective layer is less susceptible to scratches, and has a higher melting point than the adhesive layer.

The airtightness of the bag is maintained by welding together the adhesive layers formed on the inside of the film to be welded. Due to the need for smaller size, compactness, and ease of handling in logistics and packaging, the welded package is often further welded together to secure the bags together.

JP 2011-11784 A

To weld bags together while maintaining their airtightness, it is necessary to weld the outer protective layers of the bags together. When an ultrasonically vibrating horn is pressed against stacked bags to heat the protective layers up to their melting point, the bags melt and holes appear, making it difficult to ensure the airtightness of the bags as a package.

The laminated welded film body comprises a first film substrate having a first film in which a first protective layer and a first adhesive layer having a lower melting point than the first protective layer are laminated, a second film in which a second protective layer and a second adhesive layer having a lower melting point than the second protective layer are laminated, a third film in which a third protective layer and a third adhesive layer having a lower melting point than the third protective layer are laminated, and a fourth film in which a fourth protective layer and a fourth adhesive layer having a lower melting point than the fourth protective layer are laminated, and the adhesive is applied between the first protective layer and the second protective layer of the first film substrate and/or between the third protective layer and the fourth protective layer of the second film substrate. A laminated welded film body in which parts of layers are welded together to seal them, the second protective layer of the first film substrate and the third protective layer of the second film substrate are welded and fixed by an adhesive layer eluted from at least one of the first adhesive layer to the fourth adhesive layer through the first melt-through portion of the second protective layer and/or the second melt-through portion of the third protective layer, and the welded and fixed portion is surrounded in a plan view by a first welded portion in which the first adhesive layer and the second adhesive layer of the first film substrate are welded together and/or a second welded portion in which the third adhesive layer and the fourth adhesive layer of the second film substrate are welded together.

In the laminated welded film body, a part of the first adhesive layer of a first film in which a first protective layer and a first adhesive layer having a melting point lower than that of the first protective layer are laminated, and a part of the second adhesive layer of a second film in which a second protective layer and a second adhesive layer having a melting point lower than that of the second protective layer are laminated are welded and sealed in a state in which a packaged item is packaged between the first film and the second film, and the laminated first film and the second film are folded so that the second protective layer is located on the inside and faces each other, and the one second protective layer and the other second protective layer that are opposed by the folding are folded so that the one The first fusion-through portion of the second protective layer and/or the second fusion-through portion of the other second protective layer are welded and fixed by an adhesive layer eluted from at least one of the first adhesive layer and the second adhesive layer, and a first fusion portion in which the first adhesive layer and the second adhesive layer are welded is provided on the side of the one second protective layer, surrounding the welded and fixed welded portion in a planar view, and a second fusion portion in which the first adhesive layer and the second adhesive layer are welded is provided on the side of the other second protective layer, surrounding the welded and fixed welded portion in a planar view.

The ultrasonic welding machine comprises a horn having a vibration surface that contacts the workpiece, a vibration unit that ultrasonically vibrates the horn, an oscillator that drives the vibration unit, and a horn receiver that holds the workpiece between the horn and the horn, and the horn receiver has a recess or hole on the receiving surface that contacts the workpiece that is smaller in area than the vibration surface.

A method for manufacturing a laminated welded film body includes preparing a first film substrate to which a portion of the first adhesive layer of a first film in which a first protective layer and a first adhesive layer having a lower melting point than the first protective layer are laminated, and a portion of the second adhesive layer of a second film in which a second protective layer and a second adhesive layer having a lower melting point than the second protective layer are laminated, and a second film substrate to which a portion of the third adhesive layer of a third film in which a third protective layer and a third adhesive layer having a lower melting point than the third protective layer are laminated, and a portion of the fourth adhesive layer of a fourth film in which a fourth protective layer and a fourth adhesive layer having a lower melting point than the fourth protective layer are laminated, and arranging the first film substrate and the second film substrate in a superimposed manner between a horn having a vibration surface and a horn receiver having a recess or hole in a receiving surface corresponding to the vibration surface, and in a state in which the first film substrate and the second film substrate are sandwiched between the vibration surface and the receiving surface, The first film substrate and the second film substrate are heated by the vibration of the horn, and the temperature of the portion corresponding to the recess or the hole is made higher than that of the portion corresponding to the periphery of the recess or the hole. In the portion corresponding to the recess or the hole, a first melt-through portion is formed by melting and penetrating the first protective layer and/or the second protective layer of the first film substrate, and/or a second melt-through portion is formed by melting and penetrating the third protective layer and/or the fourth protective layer of the second film substrate, and a welded and fixed portion is formed by welding and fixing with an adhesive layer eluted from a portion of any one of the first adhesive layer to the fourth adhesive layer, and in the portion corresponding to the periphery of the recess or the hole, a first welded portion is formed in which the first adhesive layer and the second adhesive layer are welded to each other around the welded and fixed portion, and/or a second welded portion is formed in which the third adhesive layer and the fourth adhesive layer are welded to each other around the welded and fixed portion.

A method for manufacturing a laminated welded film body includes preparing a laminated welded film body in which a part of a first adhesive layer of a first film in which a first protective layer and a first adhesive layer having a melting point lower than that of the first protective layer are laminated, and a part of a second adhesive layer of a second film in which a second protective layer and a second adhesive layer having a melting point lower than that of the second protective layer are laminated, and the laminated welded film body is welded and sealed in a state in which a packaged object is packaged between the first film and the second film, folding the laminated welded film body so that the second protective layer is located on the inside and faces each other, arranging one of the second protective layers and the other of the second protective layers that are folded and overlapped opposite each other between a horn having a vibration surface and a horn receiver having a recess or hole in a receiving surface corresponding to the vibration surface, and placing the one of the second protective layers and the other of the second protective layers that are overlapped and sandwiched between the vibration surface and the receiving surface, and then, placing the first film and the second film in the state in which the one of the second protective layers and the other of the second protective layers that are overlapped are sandwiched between the vibration surface and the receiving surface. By heating with the vibration of the horn, the temperature of the portion corresponding to the recess or hole is made higher than that of the portion corresponding to the periphery of the recess or hole, and a welded and fixed portion is formed in the portion corresponding to the recess or hole by the adhesive layer eluted from at least one of the first adhesive layer and the second adhesive layer through the first melted through portion that melts and penetrates the second protective layer of the one side, and/or the second melted through portion that melts and penetrates the second protective layer of the other side, and a first welded portion is formed in the portion corresponding to the periphery of the recess or hole, in which the first adhesive layer and the second adhesive layer are welded to the side of the second protective layer of the one side, surrounding the welded and fixed portion in a planar view, and/or a second welded portion is formed in which the first adhesive layer and the second adhesive layer are welded to the side of the second protective layer of the other side, surrounding the welded and fixed portion in a planar view.

FIG. 1 is a schematic perspective view showing a configuration of a laminated weldable film body according to a first embodiment. FIG. 2 is a schematic cross-sectional side view of a first film substrate. FIG. FIG. 2 is a schematic cross-sectional side view of a first film substrate. FIG. FIG. 11 is a schematic cross-sectional side view of a main portion for explaining a third welded portion. FIG. 2 is a block diagram showing the configuration of an ultrasonic welding machine. FIG. FIG. 4 is a flowchart of a method for producing a laminated weldable film body. FIG. 4 is a diagram for explaining an example of operating conditions of an ultrasonic welding machine. FIG. 2 is a diagram for explaining the thickness levels of an adhesive layer, a surface layer, and an intermediate layer. FIG. 13 is a diagram for explaining the influence of the hole diameter of the third hole. FIG. 13 is a diagram for explaining the influence of the hole diameter of the third hole. FIG. 13 is a diagram for explaining the influence of the thickness of an intermediate layer. FIG. 13 is a diagram for explaining the influence of the thickness of an intermediate layer. FIG. 11 is a schematic perspective view showing the configuration of a laminated weldable film body according to a second embodiment. FIG. 11 is a schematic cross-sectional side view of a main portion for explaining a third welded portion. 4 is a flowchart of a method for producing a laminated weldable film body.

First embodiment In this embodiment, a characteristic example of a laminated weldable film body and a manufacturing method for the laminated weldable film body will be described. As shown in Fig. 1, a laminated weldable film body 1 includes a first film substrate 2 as an object to be welded and a second film substrate 3 as an object to be welded. The first film substrate 2 and the second film substrate 3 are bag-shaped and are sealed and airtight.

The first packaged item 4 is stored inside the first film base 2. The second packaged item 5 is stored inside the second film base 3. The insides of the first film base 2 and the second film base 3 are depressurized. Even if the laminated welded film body 1 is immersed in water, the first packaged item 4 and the second packaged item 5 do not get wet. It is also possible for only one of the first packaged item 4 and the second packaged item 5 to be stored in the laminated welded film body 1.

The first film substrate 2 and the second film substrate 3 are rectangular in plan view. One longitudinal end of the first film substrate 2 is the first end 2a. The other longitudinal end of the first film substrate 2 is the second end 2b. One longitudinal end of the second film substrate 3 is the third end 3a. The other longitudinal end of the second film substrate 3 is the fourth end 3b.

The first packaged item 4 is closer to the second end 2b and farther from the first end 2a. The second packaged item 5 is closer to the fourth end 3b and farther from the third end 3a.

A portion of the first end 2a of the first film substrate 2 overlaps with a portion of the third end 3a of the second film substrate 3. A third welded portion 6 is formed where the first film substrate 2 and the second film substrate 3 overlap. The first film substrate 2 and the second film substrate 3 are welded to each other at the third welded portion 6.

At the surface where the first film substrate 2 and the second film substrate 3 are welded, the longitudinal direction of the first film substrate 2 and the second film substrate 3 is the X direction, and the width direction is the Y direction. The thickness direction of the first film substrate 2 at the location where the first film substrate 2 and the second film substrate 3 are welded is the Z direction.

Figure 2 is a cross-sectional view of the first film base 2 as viewed from the X-negative direction. As shown in Figure 2, the first film base 2 comprises a first film 7 and a second film 8. The first film 7 is mainly arranged in the Z-positive direction of the first film base 2. The second film 8 is mainly arranged in the Z-negative direction of the first film base 2. The first film 7 and the second film 8 are connected in the Y-positive and Y-negative directions of the first film base 2. The first film base 2 is cylindrical.

In the first film 7, a first protective layer 9 and a first adhesive layer 11 serving as an adhesive layer are laminated. The first protective layer 9 is located on the outside. The first adhesive layer 11 is located on the inside. In the first protective layer 9, a first surface layer 12 and a first intermediate layer 13 are laminated. The first intermediate layer 13 makes it easier to bond the first adhesive layer 11 and the first surface layer 12. The first adhesive layer 11 has a lower melting point than the first protective layer 9.

In the second film 8, a second protective layer 14 and a second adhesive layer 15 serving as an adhesive layer are laminated. The second protective layer 14 is located on the outside. The second adhesive layer 15 is located on the inside. In the second protective layer 14, a second surface layer 16 and a second intermediate layer 17 are laminated. The second intermediate layer 17 makes it easier to bond the second adhesive layer 15 and the second surface layer 16. The first internal space 18, which is the space inside the first film substrate 2, is in an airtight state. The second adhesive layer 15 has a lower melting point than the second protective layer 14.

Figure 3 is a cross-sectional view of the second film base 3 as viewed from the X-negative direction. As shown in Figure 3, the second film base 3 includes a third film 19 and a fourth film 21. The third film 19 is mainly arranged in the Z-positive direction of the second film base 3. The fourth film 21 is mainly arranged in the Z-negative direction of the second film base 3. The third film 19 and the fourth film 21 are connected in the Y-positive and Y-negative directions of the second film base 3. The second film base 3 is cylindrical.

In the third film 19, a third protective layer 22 and a third adhesive layer 23 serving as an adhesive layer are laminated. The third protective layer 22 is located on the outside. The third adhesive layer 23 is located on the inside. In the third protective layer 22, a third surface layer 24 and a third intermediate layer 25 are laminated. The third intermediate layer 25 makes it easier to bond the third adhesive layer 23 and the third surface layer 24. The third adhesive layer 23 has a lower melting point than the third protective layer 22.

In the fourth film 21, a fourth protective layer 26 and a fourth adhesive layer 27 as an adhesive layer are laminated. The fourth protective layer 26 is located on the outside. The fourth adhesive layer 27 is located on the inside. In the fourth protective layer 26, a fourth surface layer 28 and a fourth intermediate layer 29 are laminated. The fourth intermediate layer 29 makes it easier to bond the fourth adhesive layer 27 and the fourth surface layer 28. The second internal space 31, which is the space inside the second film substrate 3, is in an airtight state. The fourth adhesive layer 27 has a lower melting point than the fourth protective layer 26.

Figure 4 is a cross-sectional view of the first film substrate 2 as viewed from the Y-negative direction. As shown in Figure 4, at the first end 2a and the second end 2b, a portion of the first adhesive layer 11 of the first film 7 and a portion of the second adhesive layer 15 of the second film 8 are welded together in a bag shape. Since the first end 2a and the second end 2b are sealed, the first internal space 18 of the first film substrate 2 is airtight.

Figure 5 is a cross-sectional view of the second film substrate 3 as viewed from the Y-negative direction. As shown in Figure 5, at the third end 3a and the fourth end 3b, a portion of the third adhesive layer 23 of the third film 19 and a portion of the fourth adhesive layer 27 of the fourth film 21 are welded together in a bag shape. Since the third end 3a and the fourth end 3b are sealed, the second internal space 31 of the second film substrate 3 is airtight.

The laminated welded film body 1 packages a packaged item such as a first packaged item 4 or a second packaged item 5 between the first protective layer 9 and the second protective layer 14 of the first film base 2 and/or between the third protective layer 22 and the fourth protective layer 26 of the second film base 3, and seals the package by welding together parts of the first adhesive layer 11 and the second adhesive layer 15. Furthermore, the laminated welded film body 1 seals the package by welding together parts of the third adhesive layer 23 and the fourth adhesive layer 27.

In this embodiment, the first packaged item 4 is packaged and sealed between the first protective layer 9 and the second protective layer 14 of the first film substrate 2. The second packaged item 5 is packaged and sealed between the third protective layer 22 and the fourth protective layer 26 of the second film substrate 3. The laminated welded film body 1 may package only one of the first packaged item 4 and the second packaged item 5.

The first surface layer 12, the second surface layer 16, the third surface layer 24, and the fourth surface layer 28 are layers that are resistant to scratches. The first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 have a lower melting point than the first protective layer 9, the second protective layer 14, the third protective layer 22, and the fourth protective layer 26, and are layers that are easily welded when heated.

Figure 6 is a cross-sectional view taken along line AA in Figure 1. As shown in Figure 6, the third welded portion 6 becomes hot due to the shape of the third hole 38c in the horn receiver 38, and as a result, the second protective layer 14 melts and is penetrated, forming a first hole 32 in the second protective layer 14. The first film substrate 2 has a first welded portion 33 surrounding the first hole 32 in the second protective layer 14. In the first welded portion 33, the first adhesive layer 11 and the second adhesive layer 15 are welded together.

Similarly, the third welded portion 6 becomes hot due to the shape of the third hole 38c provided in the horn receiver 38, and as a result, the third protective layer 22 melts and is penetrated, forming a second hole 34. The first hole 32 and the second hole 34 face each other. The second film substrate 3 has a second welded portion 35 that surrounds the second hole 34 of the third protective layer 22. In the second welded portion 35, the third adhesive layer 23 and the fourth adhesive layer 27 are welded together.

In the third welded portion 6, a portion of the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 are mixed through the first hole 32 and the second hole 34.

The inside of the first hole 32 in the third welded portion 6 is the first molten penetration portion 6a. The inside of the second hole 34 in the third welded portion 6 is the second molten penetration portion 6b. The portion between the first molten penetration portion 6a and the second molten penetration portion 6b in the third welded portion 6 is the welded fixed portion 6c. The portion where the adhesive layer extends between the second protective layer 14 and the third protective layer 22 is also the third welded portion 6.

The second protective layer 14 of the first film substrate 2 and the third protective layer 22 of the second film substrate 3 are welded and fixed by an adhesive layer eluted from at least one of the first adhesive layer 11 to the fourth adhesive layer 27 via the first melt-through portion 6a of the second protective layer 14 and/or the second melt-through portion 6b of the third protective layer 22. The eluted adhesive layer is present between the first film substrate 2 and the second film substrate 3, and the first film substrate 2 and the second film substrate 3 are welded and fixed.

The welded and fixed portion 6c is surrounded in a planar view by a first welded portion 33 formed by welding the first adhesive layer 11 and the second adhesive layer 15 of the first film substrate 2 together, and/or a second welded portion 35 formed by welding the third adhesive layer 23 and the fourth adhesive layer 27 of the second film substrate 3 together. This planar view indicates a view from a direction perpendicular to the surface of the first film substrate 2 at the first welded portion 33.

According to this configuration, the welded fixing portion 6c is surrounded in a plan view by the first welded portion 33 formed by welding the first adhesive layer 11 and the second adhesive layer 15 of the first film base 2, and/or the second welded portion 35 formed by welding the third adhesive layer 23 and the fourth adhesive layer 27 of the second film base 3. Therefore, when the first packaged item 4 is packaged and sealed between the first protective layer 9 and the second protective layer 14 of the first film base 2, the inside of the first film base 2 can maintain an airtight state even if it is connected to the outside (external air) when the first molten penetration portion 6a of the first film base 2 is formed (when it melts and penetrates). Similarly, when the second packaged item 5 is packaged and sealed between the third protective layer 22 and the fourth protective layer 26 of the second film substrate 3, the inside of the second film substrate 3 can be maintained in an airtight state even if the second molten-through portion 6b of the second film substrate 3 is connected to the outside (external air) when it is formed (melted and pierced).

In addition, when the first melt-penetrating portion 6a and the second melt-penetrating portion 6b are arranged in a position facing each other (a position where they overlap in a planar manner when stacked) to form the welded fixing portion 6c, the airtight state of each of the first film substrate 2 and the second film substrate 3 can be maintained, and the first film substrate 2 and the second film substrate 3 can be securely fixed by welding at the welded fixing portion 6c.

The third welded portion 6 may include a portion of the second protective layer 14 and the third protective layer 22 melted. In other words, the welded fixed portion 6c may include a portion of the welded second protective layer 14 and the third protective layer 22. The welded fixed portion 6c may include a portion of the first protective layer 9 to the fourth protective layer 26. With this configuration, in order to weld the second protective layer 14 and the third protective layer 22, in addition to the adhesive force due to the eluted adhesive layer described above, the adhesive force due to the welding between the second protective layer 14 and the third protective layer 22 acts in the welded fixed portion 6c, so that the first film substrate 2 and the second film substrate 3 can be reliably fixed.

The material of the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 includes polyethylene or CPP. The material of the first protective layer 9, the second protective layer 14, the third protective layer 22, and the fourth protective layer 26 includes PET or nylon. CPP may be replaced with polypropylene.

The melting point of polyethylene is lower than 130°C. The melting point of CPP is 138°C. The melting point of PET is 264°C, and the melting point of nylon is 215°C. The melting points of the first adhesive layer 11 to the fourth adhesive layer 27 are lower than the melting points of the first protective layer 9 to the fourth protective layer 26. According to the configuration of the laminated welded film body 1, the first protective layer 9, the second protective layer 14, the third protective layer 22, and the fourth protective layer 26 can form the first melt-penetrating part 6a, the second melt-penetrating part 6b, and the welded fixing part 6c by partially applying a temperature higher than that of the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27. Transparent vapor-deposited PET with silicon oxide or aluminum oxide vapor-deposited on the surface may be used for the PET.

The ultrasonic welding machine 36 shown in FIG. 7 is a machine that welds the first film substrate 2 and the second film substrate 3. As shown in FIG. 7, the ultrasonic welding machine 36 has a base 37. The base 37 has a mounting portion 37a and a support portion 37b.

A horn receiver 38 is replaceably installed on the mounting portion 37a. The upper surface of the horn receiver 38 is the receiving surface 38a. The first film substrate 2 and the second film substrate 3 are arranged on top of each other on the receiving surface 38a of the horn receiver 38. The support portion 37b stands in the direction of gravity. A linear motion mechanism 39 is installed on the surface of the support portion 37b facing the mounting portion 37a. The linear motion mechanism 39 includes a rail 39b and a moving portion 39a. The rail 39b is installed on the support portion 37b. The linear motion mechanism 39 includes a servo motor. When the servo motor rotates, the linear motion mechanism 39 moves the moving portion 39a. The moving portion 39a rises and falls along the rail 39b. A vibration portion 41 is installed on the moving portion 39a on the surface facing the mounting portion 37a. A horn 42 is installed on the vibration portion 41 on the surface facing the mounting portion 37a.

The ultrasonic welding machine 36 includes a control unit 43, a drive unit 44, and an oscillator 45. The control unit 43 controls the operation of the ultrasonic welding machine 36. The drive unit 44 is electrically connected to the control unit 43 and the linear motion mechanism 39. The drive unit 44 inputs an instruction signal from the control unit 43 and drives the servo motor of the linear motion mechanism 39 according to the instruction signal.

The control unit 43 outputs an oscillation start signal or an oscillation stop signal to the oscillator 45. The oscillator 45 has an oscillation circuit and forms a drive signal when it receives an oscillation start signal. The oscillator 45 outputs a drive signal to the vibration unit 41 to drive the vibration unit 41. The vibration unit 41 ultrasonically vibrates the horn 42. The horn 42 has a vibration surface 42a that contacts the first film substrate 2. The ultrasonic vibration is transmitted from the vibration surface 42a to the first film substrate 2. A start switch 46 is electrically connected to the control unit 43.

When the operator operates the start switch 46, the oscillator 45 vibrates the vibration unit 41, causing the horn 42 to vibrate. The drive unit 44 lowers the horn 42. As the horn 42 lowers, the first film substrate 2 and the second film substrate 3 are clamped between the horn 42 and the horn receiver 38. The horn 42 vibrates the first film substrate 2 and the second film substrate 3 for a predetermined time. When the predetermined time has elapsed, the oscillator 45 stops the vibration of the horn 42, and the drive unit 44 raises the horn 42.

The maximum output of the oscillator 45 is preferably 30 W or more and 50 W or less. The rated oscillation frequency of the oscillator 45 is preferably 50 kHz or more and 70 kHz or less. The frequency of the horn 42 changes subtly due to the load applied to the horn 42, changes in temperature, etc. The oscillator 45 automatically fine-tunes the frequency of the drive signal it outputs in response to the subtle changes in the horn 42. Automatic fine-tuning of the frequency of the drive signal is called automatic tracking. The oscillator 45 is equipped with a timer, and adjusts the time for driving the vibration unit 41 between 0.1 and 7 seconds.

As shown in FIG. 8, the planar shape of the excitation surface 42a of the horn 42 is circular. The diameter of the excitation surface 42a, that is, the excitation surface diameter 42b, is not particularly limited, but is, for example, 8 mm in this embodiment. The material of the horn 42 is metal, such as aluminum, titanium, or steel.

As shown in FIG. 9, the planar shape of the receiving surface 38a of the horn receiver 38 is circular. The diameter of the receiving surface 38a, that is, the receiving surface diameter 38b, is not particularly limited, but is, for example, 12 mm in this embodiment. The receiving surface diameter 38b is larger than the vibration surface diameter 42b. The material of the horn receiver 38 is metal, and in this embodiment, for example, stainless steel.

The horn receiver 38 has a third hole 38c in the center of the receiving surface 38a. The third diameter 38d of the third hole 38c is smaller than the vibration surface diameter 42b. Therefore, the horn receiver 38 has a third hole 38c with an area smaller than the area of the vibration surface 42a on the receiving surface 38a that contacts the second film substrate 3. The horn receiver 38 may have a recess instead of the third hole 38c. The third hole 38c and the recess need only be recessed from the receiving surface 38a.

As shown in FIG. 6, the horn receiver 38 and the horn 42 clamp the first film substrate 2 and the second film substrate 3. The horn 42 ultrasonically vibrates while the first film substrate 2 and the second film substrate 3 are pressed. The ultrasonic vibration is transmitted from the vibration surface 42a to the first film substrate 2 and the second film substrate 3. The ultrasonic vibration causes the first film substrate 2 and the second film substrate 3 to rub against each other, generating frictional heat.

The temperature rises at the locations of the third welded portion 6, the first welded portion 33, and the second welded portion 35. A part of the heat accumulated in the first film substrate 2 and the second film substrate 3 is conducted from the receiving surface 38a to the horn receiver 38 and dissipated. Since the heat accumulated in the first film substrate 2 and the second film substrate 3 is not conducted through the third hole 38c, the temperature between the third hole 38c and the vibration surface 42a is higher than the temperature between the receiving surface 38a and the vibration surface 42a. In more detail, the temperature between the third hole 38c and the vibration surface 42a is 250°C or higher, exceeding the melting points of the second protective layer 14 and the third protective layer 22. The temperature between the periphery of the third hole 38c and the vibration surface 42a is 130°C or higher and 150°C or lower, exceeding the melting points of the first adhesive layer 11 to the fourth adhesive layer 27.

When the temperature of the second protective layer 14 and the third protective layer 22 between the third hole 38c and the vibration surface 42a exceeds the melting point, a first hole 32 is formed in the second protective layer 14. A second hole 34 is formed in the third protective layer 22. Since the second protective layer 14 and the third protective layer 22 are made of the same material, the first hole 32 and the second hole 34 are formed at approximately the same time.

The melting points of the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 are lower than those of the second protective layer 14 and the third protective layer 22. Therefore, when the first hole 32 and the second hole 34 are formed substantially simultaneously, the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 are melted between the third hole 38c and the vibration surface 42a. Therefore, the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 are mixed between the third hole 38c and the vibration surface 42a. As a result, the third welded portion 6 is formed.

Around the third hole 38c, the temperature between the receiving surface 38a and the vibration surface 42a is higher than the melting points of the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27, and is lower than the melting points of the second protective layer 14 and the third protective layer 22. As the first adhesive layer 11, the second adhesive layer 15, the third adhesive layer 23, and the fourth adhesive layer 27 melt, the first welded portion 33 and the second welded portion 35 are formed.

The ultrasonic welder 36 heats the first film substrate 2 and the second film substrate 3 at the location facing the third hole 38c to a higher temperature than the location facing the periphery of the third hole 38c. When forming the third hole 38c into a recess, the ultrasonic welder 36 heats the first film substrate 2 and the second film substrate 3 at the location facing the recess to a higher temperature than the location facing the periphery of the recess.

According to this configuration, the second protective layer 14 melts in the first film substrate 2 at a location facing the recess or third hole 38c of the horn receiver 38, forming the first melt-through portion 6a. The third protective layer 22 melts in the second film substrate 3 at a location facing the recess or third hole 38c of the horn receiver 38, forming the second melt-through portion 6b.

The adhesive layer can be dissolved and welded through the first melt-through portion 6a of the second protective layer 14 and the second melt-through portion 6b of the third protective layer 22. Around the recess or third hole 38c of the horn receiver 38, the internal adhesive layer can be welded without drilling holes or through-holes in the protective layer.

When viewed from above on the receiving surface 38a, the area of the recess or third hole 38c is 1% to 80% of the area of the vibration surface 42a. With this configuration, the temperature of the first film substrate 2 and the second film substrate 3 at the location facing the recess or third hole 38c can be made higher than the temperature around the recess or third hole 38c.

According to the configuration of the ultrasonic welding machine 36, the oscillator 45 drives the vibration unit 41, which then ultrasonically vibrates the horn 42. The first film substrate 2 and the second film substrate 3 are sandwiched between the horn 42 and the horn receiver 38 and vibrate to be heated. The horn receiver 38 has a recess or third hole 38c on the receiving surface 38a, the area of which is smaller than the area of the vibration surface 42a. At this time, the temperature of the first film substrate 2 and the second film substrate 3 at the location facing the recess or third hole 38c can be made higher than the temperature of the first film substrate 2 and the second film substrate 3 around the recess or third hole 38c.

Next, the manufacturing method of the laminated welded film body 1 described above will be described with reference to FIG. 10. In the flow chart of FIG. 10, step S1 is the packaging body installation process. In step S1, first, the first film substrate 2 and the second film substrate 3 are prepared.

The first film base 2 is formed by welding a part of the first adhesive layer 11 of the first film 7 and a part of the second adhesive layer 15 of the second film 8. The first film 7 is formed by laminating a first protective layer 9 and a first adhesive layer 11. The second film 8 is formed by laminating a second protective layer 14 and a second adhesive layer 15. The melting point of the first adhesive layer 11 is lower than that of the first protective layer 9. The melting point of the second adhesive layer 15 is lower than that of the second protective layer 14. The first packaged item 4 is stored in the first film base 2.

The second film base 3 is formed by welding a part of the third adhesive layer 23 of the third film 19 and a part of the fourth adhesive layer 27 of the fourth film 21. The third film 19 is formed by laminating a third protective layer 22 and a third adhesive layer 23. The fourth film 21 is formed by laminating a fourth protective layer 26 and a fourth adhesive layer 27. The melting point of the third adhesive layer 23 is lower than that of the third protective layer 22. The melting point of the fourth adhesive layer 27 is lower than that of the fourth protective layer 26. The second packaged item 5 is stored in the second film base 3.

The first film substrate 2 and the second film substrate 3 are placed in a stacked manner between the horn 42 having the vibration surface 42a and the horn receiver 38 having a recess or a third hole 38c on the receiving surface 38a corresponding to the vibration surface 42a. Next, proceed to step S2.

Step S2 is a heating process. In step S2, the first film substrate 2 and the second film substrate 3 are sandwiched between the vibration surface 42a and the receiving surface 38a, and the ultrasonic welding machine 36 heats the first film substrate 2 and the second film substrate 3 by vibrating the horn 42. The temperature of the area corresponding to the recess or the third hole 38c is made higher than the temperature of the area corresponding to the recess or the periphery of the third hole 38c.

At the portion corresponding to the recess or third hole 38c, the ultrasonic welding machine 36 forms a welded and fixed portion 6c, which is welded and fixed with an adhesive layer dissolved from a portion of any one of the first adhesive layer 11 to the fourth adhesive layer 27, via a first melted through portion 6a that has melted and penetrated the first protective layer 9 and/or the second protective layer 14 of the first film substrate 2, and/or a second melted through portion 6b that has melted and penetrated the third protective layer 22 and/or the fourth protective layer 26 of the second film substrate 3.

At the area corresponding to the recess or the periphery of the third hole 38c, the ultrasonic welding machine 36 forms a first welded portion 33 surrounding the welded fixed portion 6c and welding the first adhesive layer 11 to the second adhesive layer 15, and/or a second welded portion 35 surrounding the welded fixed portion 6c and welding the third adhesive layer 23 to the fourth adhesive layer 27.

The first melt-penetrating portion 6a, the second melt-penetrating portion 6b, the welded and fixed portion 6c, the first welded portion 33, and the second welded portion 35 are formed simultaneously. In a plan view of the laminated welded film body 1, the first packaged item 4 and the second packaged item 5 do not overlap the welded and fixed portion 6c. Next, proceed to step S3.

Step S3 is the packaging removal process. In this process, the linear motion mechanism 39 raises the horn 42. A gap is created between the horn receiver 38 and the horn 42. The laminated welded film body 1 is removed from the ultrasonic welding machine 36. Through the above process, the laminated welded film body 1 is completed.

According to this manufacturing method, the welded fixed portion 6c is surrounded in a plan view by the first welded portion 33 formed by welding the first adhesive layer 11 and the second adhesive layer 15 of the first film base 2, and/or the second welded portion 35 formed by welding the third adhesive layer 23 and the fourth adhesive layer 27 of the second film base 3. Therefore, when the first packaged item 4 is packaged and sealed between the first protective layer 9 and the second protective layer 14 of the first film base 2, the inside of the first film base 2 can maintain an airtight state even if it is connected to the outside (external air) when the first molten penetration portion 6a of the first film base 2 is formed (when it is melted and penetrated). Similarly, when the second packaged item 5 is packaged and sealed between the third protective layer 22 and the fourth protective layer 26 of the second film substrate 3, the inside of the second film substrate 3 can be maintained in an airtight state even if the second molten-through portion 6b of the second film substrate 3 is connected to the outside (external air) when it is formed (melted and pierced).

In addition, when the welded fixing portion 6c is formed where the first melt-penetrating portion 6a and the second melt-penetrating portion 6b face each other (where they overlap in a planar manner when stacked), the airtight state of each of the first film substrate 2 and the second film substrate 3 can be maintained, and the first film substrate 2 and the second film substrate 3 can be securely fixed together by welding at the welded fixing portion 6c.

In the heating process of step S2, it is preferable to heat the first film substrate 2 and the second film substrate 3 at the locations facing the recess or the third hole 38c to 250°C or higher, and to heat the first film substrate 2 and the second film substrate 3 at the locations facing the recess or the periphery of the third hole 38c to 200°C or lower.

According to this manufacturing method, the protective layer is melted by heating at a temperature (250°C or higher) higher than the melting point of the adhesive layer at a location facing the recess or the third hole 38c to form the first melt-penetrating portion 6a and/or the second melt-penetrating portion 6b. At this time, the protective layer is heated at a temperature (200°C or lower) of the melting point of the adhesive layer at a location facing the recess or the periphery of the third hole 38c to form the first melted portion 33 in the first film base 2 surrounding the welded fixed portion 6c, and/or the second melted portion 35 in the second film base 3 surrounding the welded fixed portion 6c. Therefore, even if the first melt-penetrating portion 6a and/or the second melt-penetrating portion 6b are connected to the outside (external air) when they are formed (melted and penetrated), the inside of the first film base 2 and/or the inside of the second film base 3 can maintain an airtight state.

Next, an example of welding the laminated welded film body 1 with the ultrasonic welding machine 36 is shown. Figure 11 shows an example of the operating conditions of the ultrasonic welding machine 36. In the ultrasonic welding machine 36, the vibration frequency of the horn 42 is automatically tracked. The frequency of the horn 42 changes subtly due to the load applied to the horn 42, changes in temperature, etc. The oscillator 45 automatically fine-tunes the frequency of the power output to the vibration unit 41 so as to follow the subtle changes.

The pressing force of the horn 42 can be adjusted between 0.08 MPa and 0.2 MPa, for example, using an air cylinder with an inner tube diameter of 6 mm. In this embodiment, the median pressing force of the horn 42 is between 0.1 MPa and 0.14 MPa. The welding time can be adjusted between 0.4 sec and 1 sec, for example. In this embodiment, the median welding time is between 0.6 sec and 0.8 sec.

The hole diameter of the horn receiver 38 indicates the third diameter 38d of the third hole 38c. The hole diameter of the horn receiver 38 can be changed by replacing the horn receiver 38.

As shown in FIG. 12, polyethylene was used as the material for the first adhesive layer 11 to the fourth adhesive layer 27. The thicknesses of the first adhesive layer 11 to the fourth adhesive layer 27 were 50 μm. Vapor-deposited PET was used as the material for the first surface layer 12 to the fourth surface layer 28. The thicknesses of the first surface layer 12 to the fourth surface layer 28 were 12 μm. Nylon was used as the material for the first intermediate layer 13 to the fourth intermediate layer 29. Three thickness levels were prepared for the first intermediate layer 13 to the fourth intermediate layer 29: 25 μm, 40 μm, and 50 μm.

Figures 13 and 14 show the change in the welding force between the first film substrate 2 and the second film substrate 3 when the third diameter 38d of the horn receiver 38 is changed. Each data shows the average value when there are eight samples. The hole diameter shows the third diameter 38d. The welding force shows the force required to separate the first film substrate 2 and the second film substrate 3 when the second end 2b of the first film substrate 2 and the fourth end 3b of the second film substrate 3 are pulled.

The judgment value for whether welding is possible is 0.1 kgf. When the laminated weldable film body 1 is pulled, if the first film substrate 2 and the second film substrate 3 separate, it is judged as not possible. If the first film substrate 2 and the second film substrate 3 do not separate, it is judged as possible.

The welded area is the area of the third welded portion 6. After the first film base 2 and the second film base 3 are separated, an imaging device captures an image of the third welded portion 6. An image processing device calculates the area of the third welded portion 6 using the image of the third welded portion 6.

This indicates that the welding of the first film substrate 2 and the second film substrate 3 was performed well when the third diameter 38d was in the range of 0.5 mm to 6 mm. The range of the third diameter 38d is not particularly limited. It may be changed according to the material and thickness of the first film substrate 2 and the second film substrate 3. When the third hole 38c was not present, the welding of the first film substrate 2 and the second film substrate 3 could not be performed. When the third diameter 38d was 0.5 mm, the area of the third hole 38c relative to the area of the vibration surface 42a was 0.4%. When the third diameter 38d was 6 mm, the area of the third hole 38c relative to the area of the vibration surface 42a was 56.3%. When the third diameter 38d was 7.2 mm, the area of the third hole 38c relative to the area of the vibration surface 42a was 80%. Although the data is not shown, it has been confirmed that the first film substrate 2 and the second film substrate 3 were well welded even when the third diameter 38d was 7.2 mm. Therefore, when the area of the third hole 38c is 1% to 80% of the area of the vibration surface 42a in a plan view of the receiving surface 38a, the first film substrate 2 and the second film substrate 3 can be well welded.

The bar graph in Figure 14 shows the welding force. The line graph shows the welding area. There is no strong correlation between the welding force and the welding area. When the third diameter 38d is 0.5 mm, the welding force is low compared to the welding area. When the third diameter 38d is 1 mm, the welding area is the smallest. When the third diameter 38d is 2 mm, the welding force is the strongest, there is little melting of the adhesive layer, and it can be said that it is close to the optimal condition. When the third diameter 38d is 4 mm, the welding area is the widest but the welding force is weak. The temperature has risen too much and a hole has been made in the third welded part 6. When the third diameter 38d is 6 mm, the welding is wide, but it has melted and a hole has been made in the third welded part 6. When the third diameter 38d is 0.5 mm, the welding force is the lowest but is higher than the judgment value.

Figures 15 and 16 show the change in the welding strength between the first film substrate 2 and the second film substrate 3 when the thickness of the intermediate layer is changed. Each data shows the average value for eight samples. The third diameter 38d of the third hole 38c is 2 mm. When the thickness of the intermediate layer is between 25 μm and 50 μm, the welding strength is 0.1 kgf or more, and the first film substrate 2 and the second film substrate 3 can be welded well.

The bar graph in Figure 16 shows the welding strength. The line graph shows the welding area. There is no strong correlation between the welding strength and the welding area. When the thickness level is 2, the welding strength is greater than when the thickness level is 1. In this case, the area is smaller and the adhesion is more efficient. When the thickness level is 2, the welding strength relative to the welding area is excellent.

Second Embodiment The present embodiment differs from the first embodiment in that a film substrate equivalent to the first film substrate 2 is folded and welded. Note that the same components as those in the first embodiment are denoted by the same reference numerals and redundant explanations will be omitted.

As shown in FIG. 17, the laminated welded film body 51 serving as the welded object is bag-shaped, and the inside of the laminated welded film body 51 is sealed and airtight. A third packaged object 52 serving as the packaged object is stored inside the laminated welded film body 51. The inside of the laminated welded film body 51 is depressurized. Even if the laminated welded film body 51 is immersed in water, the third packaged object 52 does not get wet.

The laminated welded film body 51 is rectangular. One end in the longitudinal direction of the laminated welded film body 51 is the first end 51a. The other end in the longitudinal direction of the laminated welded film body 51 is the second end 51b. The third packaged item 52 is close to the second end 51b and away from the first end 51a.

18 is a cross-sectional view taken along the line BB in FIG. 17. As shown in FIG. 17 and FIG. 18, in the same manner as the first film base 2 in the first embodiment, the laminated welded film body 51 has a part of the first adhesive layer 54 of the first film 55, in which the first protective layer 53 and the first adhesive layer 54 as an adhesive layer are laminated, and a part of the second adhesive layer 57 of the second film 58, in which the second protective layer 56 and the second adhesive layer 57 as an adhesive layer are laminated, welded and sealed in a state in which the third packaged item 52 is packaged between the first film 55 and the second film 58. The first film 55 and the second film 58 are welded and sealed at the first end 51a and the second end 51b. The longitudinal direction of the laminated welded film body 51 is the X direction, and the width direction is the Y direction. The thickness direction of the laminated welded film body 51 is the Z direction. The laminated welded film body 51 is folded in half in the negative X direction. The bent portion is the bent portion 51c.

As shown in FIG. 18, the laminated first film 55 and second film 58 are folded so that the second protective layer 56 faces the inner side. The one second protective layer 56 and the other second protective layer 56 that are opposed by this folding are welded and fixed by an adhesive layer eluted from at least one of the first adhesive layer 54 and the second adhesive layer 57 via the first melt-through portion 6a of the one second protective layer 56 and/or the second melt-through portion 6b of the other second protective layer 56. In the folded second protective layer 56, the one second protective layer 56 is the second protective layer 56 in the Z positive direction, and the other second protective layer 56 is the second protective layer 56 in the Z negative direction.

A first welded portion 33, in which the first adhesive layer 54 and the second adhesive layer 57 are welded to each other, is provided on one side of the second protective layer 56, surrounding the welded welded portion 6c in a planar view, and a second welded portion 35, in which the first adhesive layer 54 and the second adhesive layer 57 are welded to each other, surrounding the welded welded portion 6c in a planar view, is provided on the other side of the second protective layer 56. The adhesive layers eluted from the first adhesive layer 54 and the second adhesive layer 57 are present and welded between the folded second protective layer 56 on one side and the other second protective layer 56 on the other side.

According to this configuration, the welded fixed portion 6c is surrounded in a plan view by the first welded portion 33 formed by welding the first adhesive layer 54 and the second adhesive layer 57 provided on one of the folded second protective layers 56, and/or the second welded portion 35 formed by welding the first adhesive layer 54 and the second adhesive layer 57 provided on the other second protective layer 56. Therefore, even if the first melt-penetrated portion 6a of one second protective layer 56 and/or the second melt-penetrated portion 6b of the other second protective layer 56 are connected to the outside (external air) when they are formed (melted and penetrated), the inside where the third packaged item 52 is packaged between the first film 55 and the second film 58 can be maintained in an airtight state.

In addition, when the first melt-penetrating portion 6a of one second protective layer 56 and the second melt-penetrating portion 6b of the other second protective layer 56 are arranged at a location facing each other (a position where they overlap in a planar view when stacked), the airtight state between the first film 55 and the second film 58 can be maintained, and the second protective layers 56 that are folded and arranged facing each other can be reliably fixed to each other by welding at the melt-penetrating portion 6c.

In the laminated welded film body 51, the material of the first adhesive layer 54 and the second adhesive layer 57 preferably includes polyethylene or CPP, and the material of the first protective layer 53 and the second protective layer 56 preferably includes PET or nylon. CPP may also be polypropylene.

The melting point of polyethylene is lower than 130°C. The melting point of CPP is 138°C. The melting point of vapor-deposited PET is 264°C, and the melting point of nylon is 215°C. According to the configuration of the laminated welded film body 51, the second protective layer 56 can be partially heated to a temperature higher than that of the first adhesive layer 54 and the second adhesive layer 57, thereby forming a first melt-penetrating portion 6a on one side of the second protective layer 56 that is folded and arranged opposite to each other, a second melt-penetrating portion 6b on the other side of the second protective layer 56, and a welded fixed portion 6c. The first protective layer 53 is arranged on the outside and can protect the laminated welded film body 51.

The welded and fixed portion 6c of the laminated welded film body 51 preferably includes a part of the first protective layer 53 and/or the second protective layer 56. With this configuration, in the welded and fixed portion 6c, in addition to the adhesive force due to the eluted adhesive layer described above, the adhesive force due to the welding between one second protective layer 56 and the other second protective layer 56 that are folded and facing each other acts, so that one second protective layer 56 and the other second protective layer 56 can be reliably fixed in the folded state.

Next, the manufacturing method of the laminated welded film body 51 described above will be described with reference to FIG. 19. In the flow chart of FIG. 19, step S11 is a package folding process. In step S11, a laminated welded film body 51 without a folded portion 51c is prepared. The first end 51a and the second end 51b of the laminated welded film body 51 are welded and sealed in a state in which the third packaged item 52 is packaged between the first film 55 and the second film 58. The first protective layer 53 and the first adhesive layer 54 are laminated in the first film 55. The second protective layer 56 and the second adhesive layer 57 are laminated in the second film 58. In the laminated welded film body 51, a part of the first adhesive layer 54 of the first film 55 and a part of the second adhesive layer 57 of the second film 58 are welded and sealed. The laminated welded film body 51 is folded so that the second protective layer 56 is located on the inside and faces each other. Next, proceed to step S12.

Step S12 is a packaging installation process. In step S12, one second protective layer 56 and the other second protective layer 56 are folded and stacked facing each other and placed between the horn 42 having the vibration surface 42a and the horn receiver 38 having a recess or third hole 38c in the receiving surface 38a corresponding to the vibration surface 42a. Next, proceed to step S13.

Step S13 is a heating process. In step S13, with the stacked second protective layers 56 on one side and the other second protective layer 56 sandwiched between the vibration surface 42a and the receiving surface 38a, the ultrasonic welding machine 36 heats the laminated welded film body 51 by the vibration of the horn 42, with the area corresponding to the recess or third hole 38c at a higher temperature than the area corresponding to the periphery of the recess or third hole 38c.

At the portion corresponding to the recess or third hole 38c, the ultrasonic welding machine 36 forms a welded and fixed portion 6c that is welded and fixed with an adhesive layer eluted from at least one of the first adhesive layer 54 and the second adhesive layer 57 via a first melted through portion 6a that has melted and penetrated one of the second protective layers 56 and/or a second melted through portion 6b that has melted and penetrated the other of the second protective layers 56.

At a portion corresponding to the recess or the periphery of the third hole 38c, the ultrasonic welding machine 36 forms a first welded portion 33 in which the first adhesive layer 54 and the second adhesive layer 57 are welded to one side of the second protective layer 56, surrounding the welded fixed portion 6c in a planar view, and/or a second welded portion 35 in which the first adhesive layer 54 and the second adhesive layer 57 are welded to the other side of the second protective layer 56, surrounding the welded fixed portion 6c in a planar view.

The first melt-penetrating portion 6a, the second melt-penetrating portion 6b, the welded and fixed portion 6c, the first welded portion 33, and the second welded portion 35 are formed simultaneously. In a plan view of the laminated welded film body 51, the third packaged item 52 does not overlap with the welded and fixed portion 6c. Next, proceed to step S14.

Step S14 is the packaging removal process. In this process, the linear motion mechanism 39 raises the horn 42. A gap is created between the horn receiver 38 and the horn 42. The laminated welded film body 51 is removed from the ultrasonic welding machine 36. Through the above process, the laminated welded film body 51 is completed.

According to this method, the welded fixed portion 6c is surrounded in a plan view by the first welded portion 33 in which the first adhesive layer 54 and the second adhesive layer 57 are welded on one side of the second protective layer 56, and/or the second welded portion 35 in which the first adhesive layer 54 and the second adhesive layer 57 are welded on the other side of the second protective layer 56. Therefore, even if the first molten penetration portion 6a is formed (melted and penetrated) on one side of the second protective layer 56 and communicates with the outside (outside air), the inside between the first film 55 and the second film 58 can be maintained in an airtight state. Similarly, even if the second molten penetration portion 6b is formed (melted and penetrated) on the other side of the second protective layer 56 and communicates with the outside (outside air), the inside between the first film 55 and the second film 58 can be maintained in an airtight state.

In addition, when forming the welded fixing portion 6c that is arranged at the location where the first melt-penetrating portion 6a of one second protective layer 56 and the second melt-penetrating portion 6b of the other second protective layer 56 face each other (the location where they overlap in a plane when stacked), the airtight state between the first film 55 and the second film 58 can be maintained, and the second protective layers 56 that are folded and arranged opposite each other can be reliably fixed to each other by welding at the welded fixing portion 6c.

Third embodiment In the first embodiment, the layers of the first film substrate 2 and the second film substrate 3 are a combination of polyethylene, CPP, nylon, and PET. Alternatively, the layers of the first film substrate 2 and the second film substrate 3 may be a combination of OPP, which is oriented polypropylene, CPP, which is unoriented polypropylene, HDPE, which is high density polyethylene, LDPE, which is low density polyethylene, and L-LDPE, which is linear low density polyethylene. Alternatively, the layers of the first film substrate 2 and the second film substrate 3 may be a combination of PET, which is polyethylene terephthalate, O-NY, which is nylon, PA, which is polyamide, PVA, which is vinylon, EVOH, which is polyvinyl alcohol, and OPP, which is polyvinylidene chloride coated.

For example, the layers of the first film substrate 2 and the second film substrate 3 may be combined as follows: KOP/LDPE, ONY/LDPE, KONY/LDPE, PET/LDPE, PET/EVOH/LDPE, ONY/EVOH/LDPE, NY/EVOH/LDPE, OPP/EVOH/LDPE, PET/aluminum-vapor-deposited PET/LDPE. The layers of the first film substrate 2 and the second film substrate 3 may be combined as follows: NY/MXD/NY/LDPE, PVA-coated OPP/LDPE, OPP or PET/aluminum-vapor-deposited CPP, silica-vapor-deposited PET/LDPE, alumina-vapor-deposited PET/LDPE. This can also be applied to the second embodiment.

1...Laminated weldable film body, 2...First film substrate as the welded object, 3...Second film substrate as the welded object, 4...First packaged item as the packaged item, 5...Second packaged item as the packaged item, 6a...First melt-penetration portion, 6b...Second melt-penetration portion, 6c...Welded fixed portion, 7, 55...First film, 8, 58...Second film, 9, 53...First protective layer, 11, 54...First adhesive layer as adhesive layer, 14, 56...Second protective layer, 15, 57...Adhesion Second adhesive layer as layer, 19...third film, 21...fourth film, 22...third protective layer, 23...third adhesive layer as adhesive layer, 26...fourth protective layer, 27...fourth adhesive layer as adhesive layer, 33...first welded part, 35...second welded part, 38...horn receiver, 38c...third hole as hole, 41...vibration part, 42...horn, 42a...vibration surface, 45...oscillator, 51...laminated welded film body as welded object, 52...third packaged item as packaged item.

Claims (3)

a first film substrate, in which a part of a first adhesive layer of a first film in which a first protective layer and a first adhesive layer having a melting point lower than that of the first protective layer are laminated, and a part of a second adhesive layer of a second film in which a second protective layer and a second adhesive layer having a melting point lower than that of the second protective layer are laminated, are welded together;
a second film substrate having a third film in which a third protective layer and a third adhesive layer having a melting point lower than that of the third protective layer are laminated, and a fourth film in which a fourth protective layer and a fourth adhesive layer having a melting point lower than that of the fourth protective layer are laminated, and a part of the fourth adhesive layer of the fourth film in which a fourth protective layer and a fourth adhesive layer having a melting point lower than that of the fourth protective layer are laminated, and
The first film substrate and the second film substrate are arranged in a stacked manner between a horn having a vibration surface and a horn receiver having a recess or a hole in a receiving surface corresponding to the vibration surface;
With the first film substrate and the second film substrate sandwiched between the vibration surface and the receiving surface, the first film substrate and the second film substrate are heated by the vibration of the horn to heat the area corresponding to the recess or the hole to a higher temperature than the area surrounding the recess or the hole,
a first melt-through portion formed by melting and penetrating the first protective layer and/or the second protective layer of the first film substrate, and/or a second melt-through portion formed by melting and penetrating the third protective layer and/or the fourth protective layer of the second film substrate, at a portion corresponding to the recess or the hole, the first melt-through portion being welded and fixed with an adhesive layer eluted from a portion of any one of the first adhesive layer to the fourth adhesive layer;
A method for manufacturing a laminated welded film body, characterized in that a first welded portion where the first adhesive layer and the second adhesive layer are welded together surrounding the welded fixing portion, and/or a second welded portion where the third adhesive layer and the fourth adhesive layer are welded together surrounding the welded fixing portion are formed in a region corresponding to the periphery of the recess or the hole. A method for producing the laminated weldable film body according to claim 1 ,
A method for manufacturing a laminated welded film body, characterized in that the first film substrate and the second film substrate at the location facing the recess or the hole are heated to 250°C or higher, and the first film substrate and the second film substrate at the location facing the periphery of the recess or the hole are heated to 200°C or lower. A laminated welded film body is prepared in which a part of a first adhesive layer of a first film in which a first protective layer and a first adhesive layer having a melting point lower than that of the first protective layer are laminated, and a part of a second adhesive layer of a second film in which a second protective layer and a second adhesive layer having a melting point lower than that of the second protective layer are laminated, are welded and sealed in a state in which an article to be packaged is packaged between the first film and the second film;
The laminated welded film body is folded so that the second protective layer faces the inside of the film body,
One of the second protective layers and the other of the second protective layers are folded and overlapped opposite to each other and disposed between a horn having a vibration surface and a horn receiver having a recess or a hole in a receiving surface corresponding to the vibration surface;
In a state in which the one second protective layer and the other second protective layer are sandwiched between the vibration surface and the receiving surface, the first film and the second film are heated by the vibration of the horn to heat the portion corresponding to the recess or the hole to a higher temperature than the portion corresponding to the periphery of the recess or the hole,
a first melt-through portion formed by melting and penetrating the one of the second protective layers and/or a second melt-through portion formed by melting and penetrating the other of the second protective layers at a portion corresponding to the recess or the hole, the first adhesive layer and the second adhesive layer being melted and fixed by an adhesive layer eluted from at least a portion of the second adhesive layer;
A method for manufacturing a laminated welded film body, characterized in that a first welded portion is formed in a region corresponding to the periphery of the recess or hole, surrounding the welded fixing portion in a planar state, and in which the first adhesive layer and the second adhesive layer are welded to the side of the one of the second protective layers, and/or a second welded portion is formed in a region corresponding to the periphery of the recess or hole, surrounding the welded fixing portion in a planar state, and in which the first adhesive layer and the second adhesive layer are welded to the side of the other of the second protective layers.

Images